YOU SAID:
you've done this before, have
INTO JAPANESE
あなたは前にこれをやったことがあります、
BACK INTO ENGLISH
you have done this before,
INTO JAPANESE
あなたは以前にもこれをやったことがありますが、
BACK INTO ENGLISH
you've done this before,
INTO JAPANESE
以前にもこれをやったことがありますが、
BACK INTO ENGLISH
I've done this before, but
INTO JAPANESE
以前にもやったことがあるのですが、
BACK INTO ENGLISH
I have done it before,
INTO JAPANESE
以前にもやったことがありますが、
BACK INTO ENGLISH
I have done it before,
That didn't even make that much sense in English.